From a distance, I may show a great deal of ignorance on your area, so correct me if it is totally wrong.
You live in an area that is known to have soft acidic water. The whole of the Northeastern part of the continent might often fit that. Some pockets of different water, though.
You live in an area that has little limestone and lots of far harder rock like granite and marble?? Possibly lots of conifer/pine type trees that make water acidic?
So it would seem that your test shows the water I might expect, just from my limited knowledge of your area. Lots of trees to help drive the water acidic and little limestone to erode and make the water hard.
Sounds like your testing fits. Acidic with not much carbonite hardness.